Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11e169e8804519e…

MALICIOUS

PDF

72.8 KB Created: 2021-09-25 03:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 308158506a2f8ed337e9ee5455350825 SHA-1: 1b7ccbb0257fd275774870e6532ec3d46a131599 SHA-256: f11e169e8804519eeeb41d7c5c1df1d74b4368a56b7c1ba9d8d25fddecd78dec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised CMS uploads and disposable hosting domains, suggesting a link farm for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a URL with 'download after effects cracked version' in the query parameter further supports the lure of pirated software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/36455185279.pdf In PDF document text
    • http://mmprogetti.it/userfiles/files/ligumemopexoxudivonom.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/pimopitu.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/zajodupibifuruvo.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/16134132901.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/razuvituxixazudosototuk.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/xatabi.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/80710394150.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210909232915.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gofagesivo.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/piwob.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/5354119489.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132b559d2b1a---larorakus.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/dofefifedapexageme.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/mudorofivolikozuxuwesiv.pdfIn PDF document text
    • https://aneri12.eu/res/file/9058868534.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/zasekebikebutenupudo.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/57980619422.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/zutewuvobupofo.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139022b9c62a---borowebeweniteberasoj.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/sesimosomenifop.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/53309236245.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4da60e854---38419590879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+after+effects+cracked+versionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB549 17720 bytes
SHA-256: b9ba148598bc61557dcd7bc6093d83819bf93529f3259eeaa44d98f9cc26324e
font_01_sfnt_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 10716 bytes
SHA-256: 4d801c8c233da4da9358bd8b0d79cade98191964f1ea8d14cdac80cfd1b28a2b
font_02_sfnt_off0000fb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1